Device for promoting the combustion of carbon-monoxide gas



Dec. 18 1923. 1,4783%)5 A J. w. CRAIG DEVICE FOR PROMOTING THE COMBUSTION OF CARBON MONOXIDE GAS Filed July 9. 1921 L 000000 7 000000 23 O O CIGDO O -22 000000 I 2 000000 a :J

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STATES PA E- JAMES CRAIG, OF PROVIDENCE, RHODE ISLAND,'ASSIGNOR TO CARBON MONOXIDE BURNER COMPANY, OF PROVIDENCE, RHODE ISLAND, A CORPORATION OF RHODE ISLAND.

DEVICE FOR PROMOTING THE COMBUSTION OF CARBON-MONOXIDE GAS.

Application'filed July 9, 1921;

To all whom it may concern:

Be it known that I, JAMES W. CRAIG, a citizen of the United States, residing at Providence, in the county of Providence and State of Rhode Island, have invented certain new and useful Improvements in Devices for Promoting the Combustion of Carbon-Monoxide Gas, of which the following is a specification.

This invention relates to certain new and useful improvements in combustion promoting device for furnaces, the same consisting primarily of a heating element adapted to be attached to the stoking door of a furnace and is provided with a multiplicity of heating surfaces over which the air passes to facilitate heating the same before permittin it to enter the combustion chamber.

is is well known a cool draft of air introduced through the slide in the ordinary furnace door, tends to chill the gases and cool them below the point of ignition so that i11- stead of being consumed a largeportion of the carbon monoxide gas thrown off from the fuel escapes up the chimney, reducingthe heating efficiency of the furnace.

The object of my present invention is to provide an improved heating chamber of simple construction by which the atmospheric air is caused to pass over a plurallty of deflecting vanes or plates heated to a high temperature thereby causing the air in this chamber to set up a slow and lazy-rolling circulating motion in order to become thoroughly heated before being permitted to pass into the firebox, whereby the heated oxygen thus supplied through my improved device serves to produce a more nearly perfect combustion in a furnace.

With these and other objects inview, the invention consists of certain novel features of construction, as will be more fully described, and particularly pointed out in the appended claims.

In the accompanying drawings:

Figure l is a plan view showing the general shape of my improved heating chambers as attached to a furnace door to swing therewith; and showing a plurality of heatconducting ribs on its exterior.

Figure 2 is a central sectional elevation showing the arrangement of the air-deflecting vanes in the inner heating chamber.

Serial No. 483,470.

Figure 3 is a section on line 8-3 of Figure 2, showing the air-discharging openings wh1ch communicate with the furnace combustion chamber.

Figure 4 is a front end view of the outer chamber showing the movable member for controlling the air-inlet openings.

Figure 5 is a front view of the baffle plate for breaking up or distributing the air entering through the outer openings.

Flgure 6 is an edge view of. this baffle plate.

I/Vith reference to the drawings, 10 desig nates the furnace door which is mounted on hinges 11 to the body of a furnace, a portion of which is shown in section at 12.

This door is provided with a central airreceiving opening 13 through it. On the outer face of this door I secure a casing 14 which may be attached to the door in any suitable way, but I preferably provide a flange 15 on this casing through which bolts 16;are passed to secure the same to the door. The front wall 17 of this casing is provided with a pair of large openings 18 and a pair of small openings 19 both pairs of which openings are controlled by the single valve plate 20 which is centrally pivoted at 21 so that it'may be swung to either partly or wholly close either of said sets of openings, whereby the amount of inflowing air may be nicely controlled.

Spaced inwardly from the outer wall of this chamber is a baffle plate 22 which is held in position-on the inner end of the pivot pin 21 to rest against the spacing lugs 23, said plate being perforated at 24 to break up the volume of air in its passage therethrough.

To the inner surface of this door 10 I have secured an inner chamber member 25 which is provided with outturned flanges 26 being drilled to register with the holes in the outer chamber so that the single set of bolts 16 may be employed for securing both the inner and outer chambers simultaneously in position.

The side walls 41 of this inner chamber are preferably tapered slightly as shown in Figure 1', toclear the stoking opening when the door is swung back and the outer surface of this chamber is provided with a multiplicity of spaced apart heat-conducting ribs 27 which serve to collect the heat and raise the inner temperature of the chamber. V

The interior of this chamber is provided with a plurality of series of cooperating transversely arranged spaced apart air deflecting vanes supported from the side wall of the chamber, the first series 28 of these vanes being for conducting the incoming air downwardly; a second series 29 of parallelly spaced apart vanes being oppositely inclined, the ends of these two series being spaced apart to provide an opening or channel 30 between them for permitting the passage of the downwardly directed current oi air towards the bottom of the casing.

The next set 31 of vanes is inclined opposite to th set 29 with their upper ends spaced away from those of the series 29 providing a space 32 between these sets for conducting an upwardly directed current of air towards the top of the chamber, the next series 33 of vanes being set on an incline opposite to the series 31 with their ends separated slightly from the ends of this series 31 providing a passageway 3a to permit and induce a down wardly flowing current of air towards the bottom of the chamber, the ends 35 of this series of vanes being spaced from the end wall 36 of this chamber to provide a passage 37 for permitting an upward flow of the heated gases from the bottom of the chamber.

This end wall 36 is provided with an upper opening 38 and a lower opening 39 to permit the air which has become thoroughly heated by circulating over the hot vanes in the chamber to pass outwardly into the the box of the furnace.

The ends 40 of the upper and lower walls of this chamber, beyond the end wall 36, are turned in opposite directions towards each other over the discharge openings 38 and 39 so as to deflect the heated current of air in opposite directions toward each other as they pass out through these openings and impart to it a lazy-rolling or circulating motion in the firebox to permit the heated oxygen thus supplied to more completely mix with the gases therein to obtain a more perfeet combustion.

The theory of producing the rolling circulating motion of the air in this chamber is that the air at the bottom of the chamber laying against the highly heated bottom plate upon becoming heated is driven upwardly through the spaces between some of the upwardly-inclined vanes, the cooler air at the top naturally falling to take the place of the rising heated air and this cooler air in circulating around the vanes, through which heat is transmitted from the supporting sidewalls, becomes heated as it passes alternately up and down on its way through the chamber: That is, when the air on the floor or lower wall of the chamber is sufficiently expanded through absorption of heat it becomes lighter than the air immediately above it and the two columns are does not rush through this chamber but travels leisurely with a slow-rolling motion up and down, and when dlscharged through the end openings into the firebox it is highly heated and upon mixing with the fuel gases renders them more combustible.

My improved device is extremely simple and practical in construction and effective in its operation and by its use the heating eliiciency of the iurnaceisgreatly increased.

The foregoing description is directed solely towards the construction illustrated, but I desire it to be'understood that I reserve the privilege of resorting to all the mechanical changes to which the device is susceptible, the invention being defined and limited only by the terms of the appended claims. r

I claim:

1. In a combustion promoting device for furnaces, a stoking door having an air opening therethrough, an air-receiving and heating casing on the outside of said door, adjustable means for regulating the amount of air to be received into said casing, a cooperating air heating casing supported on the inner face of said door and provided with a plurality of series of cooperating air-defleeting vanes the adjacent sets of said vanes being oppositely inclined to produce a swirling or circulating effect of the air to facilitate heating the same while passing through said casing.

2. In a combustion promoting device for furnaces, a stoking door having an air open ing therethrough, an air-receiving and heating casing on the outside of said door, adjustable means for regulating the amount of air to be received into said casing, a 00- operating air-heating casing supported on the inner face of said door and provided with a plurality of transversely arranged spaced apart vanes, each supported by its end from the side wall or" said casing, said vanes being arranged in series and. each adjacent series being oppositely inclined to deflect the air alternately upwardly and downwardly while passing through said chamber.

3. In a combustion promoting device for furnaces, a stoking door having an air opening therethrough, an air-receiving and heating casing on the outside of said door, adjustable means for regulating the amount of air to be received into said casing, a cooperating air heating casing supported on the inner face of said door and provided with a plurality of transversely arranged spaced apart vanes, each supported by its end from the side wall of said casing, said vanes being arranged in series and each adjacent series being oppositely inclined, the ends of the vanes in one series being spaced from those of the next providing a vertical air passage between them to facilitate the circulation of air while passing through said chamber.

4:. In a combustion promoting device for furnaces, a stoking door having an air opening therethrough, an air-heating casing supported on the inner face of said door and provided with a plurality of sets of cooperating oppositely-inclined air-deflecting vanes, the end wall of said casing having a restricted discharge opening, and means 00- o-peratingwith said opening for deflecting the heated air as discharged therethrough.

5. In a combustion promoting device for furnaces, a stoking door having an air opening therethrough, an air-heating casing supported on the inner face of said door and provided with a plurality of series of cooperating transversely arranged air-deflecting vanes, the adjacent sets of said vanes being oppositely inclined, the end wall of said casing having an upper and a lower discharge opening and a deflecting lip cooperating with said openings to direct thestreams of air from both toward each other.

6. In a combustion promoting device for furnaces, a stoking door having an air opening therethrough, an air-heating casing supported on the inner face of said door and provided with a plurality of series of cooperating air-deflecting vanes, the adjacent sets of said vanes being oppositely-inclined to produce a swirling or circulating eiiect of the air to facilitate heating the same while passing through said casing, and said casing being provided with a plurality of spaced apart heat-conducting ribs on its outer surface.

In testimony whereof I aflix my signature.

JAMES W. CRAIG. 

